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drm: xlnx: zynqmp_dpsub: Clear status register ASAP

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Clear status register as soon as we read it.

Addressing comments from
https://lore.kernel.org/dri-devel/beb551c7-bb7e-4cd0-b166-e9aad90c4620@ideasonboard.com/

Signed-off-by: Anatoliy Klymenko <anatoliy.klymenko@amd.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240124025402.373620-4-anatoliy.klymenko@amd.com
This commit is contained in:
Anatoliy Klymenko 2024-01-23 18:54:00 -08:00 committed by Tomi Valkeinen
parent b214b37c90
commit 7717fc5b22
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/xlnx/zynqmp_dp.c
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@ -1624,6 +1624,8 @@ static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
u32 status, mask;
status = zynqmp_dp_read(dp, ZYNQMP_DP_INT_STATUS);
/* clear status register as soon as we read it */
zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status);
mask = zynqmp_dp_read(dp, ZYNQMP_DP_INT_MASK);
if (!(status & ~mask))
return IRQ_NONE;
@ -1634,8 +1636,6 @@ static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
if (status & ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK)
dev_dbg_ratelimited(dp->dev, "overflow interrupt\n");
zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status);
if (status & ZYNQMP_DP_INT_VBLANK_START)
zynqmp_dpsub_drm_handle_vblank(dp->dpsub);